Another ZeuS popular target is Nochex, a UK based online payment company specialising in smaller online businesses. Nochex is targeted by 12 different Zeus configurations with the last one also released on January 16.

Klein said that he believes this trend of targeting online payment providers will continue as more retailers allow these alternate payment methods with their Web sites.

Each configuration represents a separate set of slightly different instructions on how to attack the sites associated with a brand, with the number detected being similar in scale to the number of configurations that would be created to attack much larger companies.

Klein advised users to use highly secured browser and solutions software to protect their online transactions, and avoid using computers accessible to anybody. Online payment services provider will also need to evaluate the risks facing endpoint devices of their users, he said.